Sounds intriguing. Carbon right? What's the waist size of the ski?
I'm getting different answers on sizing for these things. Can you somehow determine if it will fit a size 13 spantik with overboots? I can take measurements for you if needed.

April is an awesome time to be in Yosemite Valley. Not too hot, not too many crowds and not too many mosquitoes. Getting from there to the east side, however, is a bit of a chore. If you have a month, though, I would definitely consider spending a week in the Valley.
For routes on the east side, depending of course on snow conditions and temps you could try the classics on Temple Crag, Incredible Hulk and several classics in the Whitney cirque. Might still be pretty cold but you might get a good window. Bear creek spire and the rock creek region has great climbing and skiing.
I haven't been into Langley but there are supposed to be some great routes in the 10's as well as good skiing...Again, might be a bit cold for a 14'er.
For skiing, you have plenty of time to do a trans sierra, sierra high route, evolution loop, palisades loop, sawtooth loop...Probably not all of those but definitely some great options.
Guidebooks:
http://www.amazon.com/Backcountry-Skiing-Californias-Eastern-Sierra/dp/0979264464/ref=pd_sim_b_4
http://www.amazon.com/Backcountry-Skiing-Californias-High-Sierra/dp/1560449136/ref=pd_bxgy_b_img_b
http://www.amazon.com/Classic-Backcountry-Snowboard-Summits-California/dp/0898866561
http://www.amazon.com/Climbing-Californias-High-Sierra-2nd/dp/0762710853/ref=sr_1_7?s=books&ie=UTF8&qid=1294962925&sr=1-7
http://www.amazon.com/High-Sierra-Climbing-Californias-Country/dp/0967239184/ref=sr_1_15?s=books&ie=UTF8&qid=1294962925&sr=1-15
and the sierra bible:
http://www.amazon.com/High-Sierra-Peaks-Passes-Trails/dp/0898869714/ref=sr_1_1?s=books&ie=UTF8&qid=1294963062&sr=1-1

I WILL THROW IN MINTY BD MOHAIR SKINS CUT TO SIZE!
$300 - 4FRNT EHP 186 from 2007/8. Drilled twice for large dukes at a 330 bsl. Once on the line, once back 4cm. Skied less than ten times but these have seen some action. Three core shots and a little edge/base separation all fixed with epoxy, metal grip and base weld. Bases are currently in good shape. Edges look good. Top sheet has a few scrapes but is in good condition. I'll post pics this evening.
Reason for selling: I'm crazy, these are the best planks you can have under your feet. Fun, lively, playful, they give back 110% and will make you a rock star on the mountain. Rock. Star. It's like Eric himself is skiing and you're just telling him where to go. Can your current sticks give you an out of body experience like that?

I have a couple things up for grabs if anyone wants them.
Mountain Hardwear Voodoo Belay Jacket size XL Gold color. Had this for a few years and it's seen quite a bit of use but is in great shape and has been stored unstuffed, cool, dry. No signs of wear except a little dirty around the cuffs.
http://www.trailspace.com/gear/mountain-hardwear/voodoo-belay-jacket/#where-to-buy
Price $100
Marmot DriClime Catalyst jacket blue size L. This is brand new.
http://www.moosejaw.com/moosejaw/shop/product_Marmot-Men-s-DriClime-Catalyst-Jacket_10039752____?cm_mmc=CSE-_-GoogleBase-_-na-_-Marmot-Men-s-DriClime-Catalyst-Jacket&ad_id=GoogleBase
Price: $60
Prices include shipping

A bit of late summer closet purging...PACKS SOLD, BOOTS STILL AVAILABLE!
LA SPORTIVA TRANGO S - Size 46.5 - $50 shipped anywhere US. This is the non-goretex version. They have seen quite a bit of wear but are still fully functional. Selling because they are too small for me and I've purchased a replacement pair.
!SOLD! - THREE CILOGEAR 30L PACKS FOR $110!!! This includes shipping. I have 2 cilogear V1 30L packs and 1 V2 30L pack. You will probably not get every single strap with each pack (I dont have them all) but I'll give you everything I have which is more than enough. I only have one frame sheet and one pad. These packs just dont work for me. They are all in brand new condition. One has seen one day of ski-touring.